CN108188361B - Method for preventing base from being fused and adhered during high-temperature alloy pouring - Google Patents
Method for preventing base from being fused and adhered during high-temperature alloy pouring Download PDFInfo
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- CN108188361B CN108188361B CN201711252059.XA CN201711252059A CN108188361B CN 108188361 B CN108188361 B CN 108188361B CN 201711252059 A CN201711252059 A CN 201711252059A CN 108188361 B CN108188361 B CN 108188361B
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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Abstract
A method for preventing a base from being melted and adhered during casting of a high-temperature alloy comprises the following steps: 1) selecting scraps with the same components as the high-temperature alloy to be poured, and compacting to prepare a scrap cake with the thickness of 30-50mm and the cross section shape matched with the cross section shape of the inner cavity of the mold; 2) placing the scraps cake prepared in the step 1) in the center of an inner cavity of a mold and on a base, wherein a clearance space of 8-13mm is formed between the periphery of the scraps cake and the corresponding cavity wall of the mold; 3) smelting the high-temperature alloy to be cast into alloy liquid, pouring the alloy liquid into an inner cavity of a mold, surrounding a scrap material cake with the alloy liquid, carrying out heat absorption melting on the scrap material cake, mixing the scrap material cake with the alloy liquid, carrying out heat release cooling forming on the alloy liquid, and taking out a base to obtain a high-temperature alloy ingot. The method has simple steps and convenient operation, effectively prevents the high-temperature alloy liquid from directly contacting with the base arranged at the bottom of the die in a padding way during pouring, achieves the effects of flow resistance and temperature reduction, prevents the base from being corroded and bonded, avoids the difference caused by bonding of the bottom components of the alloy, can be repeatedly used, and reduces the processing cost of the alloy.
Description
Technical Field
The invention relates to the field of high-temperature alloy, in particular to a method for preventing a base from being molten and adhered during high-temperature alloy pouring.
Background
Induction melting is a common method for preparing alloy materials by melting. Joule heat is generated in the metal skin layer through the alternating magnetic field to heat and melt metal, and the molten metal is stirred by electromagnetic force and mechanical mode to promote the alloy components to be uniform. With the development of new materials and new processes, in the process of smelting and preparing some special alloys, especially in the vacuum induction smelting process, not only the casting mode needs to be optimized and the casting process needs to be controlled to achieve good smelting and casting effects, but also the influence on the subsequent processes needs to be considered.
For example, in processing high temperature alloys such as GH4169, the conventional processing method is to pour the alloy into a steel die 11 directly through a runner by a top pouring method after the alloy reaches a pouring condition, and a square base 13 (sizing block) is padded at the bottom of the steel die, as shown in fig. 5. Because the temperature of the alloy liquid is high, generally above 1500 ℃, during pouring, the alloy liquid 12 with the too high temperature impacts the base 13 to cause the base 13 (sizing block) to be corroded, referring to fig. 6, the base at the bottom of the steel die 11 is partially melted by the high-temperature alloy liquid after pouring, the melted base component is mixed into the alloy, the sizing block component is mixed into the bottom of the cast ingot to cause the local component of the alloy to be unqualified, the alloy liquid is bonded with the corroded base after being cooled, and the base needs to be removed by adopting methods such as pressure, saw cutting or welding in the subsequent process, so that manpower and material resources are wasted, the removed base cannot be used continuously, and enterprise cost control is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for preventing a high-temperature alloy from being melted and adhered to a base during pouring, which has simple steps and convenient operation, effectively avoids the direct contact of high-temperature alloy liquid and the base padded at the bottom of a mould during pouring, achieves the effects of flow resistance and temperature reduction, prevents the base from being melted, corroded and adhered, avoids the difference of alloy bottom components caused by adhesion, can be smoothly taken down for repeated use, and reduces the alloy processing cost.
The technical scheme of the invention is as follows: the method for preventing the base from being molten and adhered during the casting of the high-temperature alloy comprises the following steps:
1) selecting scraps with the same components as the high-temperature alloy to be poured, and compacting to prepare a scrap cake with the thickness of 30-50mm and the cross section shape matched with the cross section shape of the inner cavity of the mold;
2) placing the scraps cake prepared in the step 1) in the center of an inner cavity of a mold and on a base, wherein a clearance space of 8-13mm is formed between the periphery of the scraps cake and the corresponding cavity wall of the mold;
3) and after the high-temperature alloy to be cast is smelted as alloy liquid and reaches the casting condition, pouring the alloy liquid into an inner cavity of a mold, surrounding a scrap material cake with the alloy liquid, carrying out heat absorption melting on the scrap material cake and mixing the scrap material cake with the alloy liquid, and taking off a base after the alloy liquid is subjected to heat release cooling forming to obtain the high-temperature alloy ingot.
In the scrap in the step 1), the amount of the scrap with the length of more than or equal to 80mm accounts for not less than 60% of the total amount of the scrap.
And step 1), after cleaning, deoiling and drying the scraps, compacting to prepare a scrap cake.
The chip material in the step 1) is a turning chip material, and the turning chip material is compacted to be made into a round cake or a square cake with the thickness of 30-50 mm.
The compaction in the step 1) is formed by extrusion through a cake making device.
The cake making device comprises a cylindrical outer die and a cylindrical pressure head, wherein the cylindrical pressure head is connected with the press machine and is in clearance fit with the cavity of the cylindrical outer die.
The selected scraps in the step 1) are uniformly laid in a cavity of a cylindrical outer die, and a columnar pressure head is driven by a press machine to compact the scraps to form scraps cakes.
The press machine is a hydraulic press.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. the thickness of the crumbs cake prepared by compaction is 30-50mm, the cross section shape is matched with the cross section shape of the inner cavity of the die, gaps are reserved between crumbs and crumbs in the crumbs cake, and the components of the crumbs cake are the same as those of the high-temperature alloy. The scrap material cake is arranged in the center of the inner cavity of the die and positioned on the base, a clearance space of 8-13mm is formed between the periphery of the scrap material cake and the corresponding cavity wall of the die, and when high-temperature alloy liquid is poured into the cavity of the die, the alloy liquid directly impacts the scrap material cake, so that the situation that the alloy liquid directly impacts the base to cause the base to be corroded and scrapped is avoided. Alloy liquid flows to the base along a gap space between the chip material cake and the wall of the inner cavity of the die, and partially permeates into the chip material cake to wrap the chip material cake. In the process of coating the scrap material cakes by the alloy liquid, the scrap material cakes are quickly melted by heat absorption and fused with the alloy liquid, and the cost of the scrap material cakes is the same as the components of the high-temperature alloy, so the component indexes of the high-temperature alloy are not influenced after fusion.
2. The amount of the scraps with the length of more than or equal to 80mm accounts for not less than 60 percent of the total amount of the scraps, so that a scrap cake main body is formed, the scrap cake is ensured to be formed in the pressing process, and the clearance between the scraps in the scrap cake is controlled.
3. After the scraps are cleaned, deoiled and dried, scraps are compacted to form scraps cakes, the scraps cakes are free of impurities, the scraps cakes are fused with the alloy liquid stably, and the stable performance of the formed high-temperature alloy is ensured.
The following further description is made with reference to the accompanying drawings and detailed description.
Drawings
FIG. 1 is a schematic representation of a cake of crumb according to one embodiment;
FIG. 2 is a schematic representation of a pressed crumb of one of the examples;
FIG. 3 is a schematic view showing that the scrap pieces are not melted during casting of an alloy liquid according to an embodiment;
FIG. 4 is a schematic view showing melting of a slug during casting of an alloy liquid according to an embodiment;
FIG. 5 is a schematic view of a mold for casting molten alloy;
FIG. 6 is a schematic diagram of the base erosion of the current mold for pouring molten alloy.
In the attached drawing, 1 is a cylindrical external mold, 2 is a cylindrical pressure head, 3 is turning scraps, 4 is a scrap round cake, 5 is a sizing block, 6 is a steel mold, and 7 is alloy liquid.
Detailed Description
Example one
Pouring GH4169 alloy at about 1500 deg.C, and melting point of GH4169 alloy of about 1350 deg.C
Referring to fig. 1 to 4, there are the following steps:
1) selecting 15kg of turning chips 3, wherein the amount of the chips with the length of more than or equal to 80mm is not less than 60% of the total amount of the chips;
2) cleaning, deoiling and blow-drying the selected turning chips 3;
3) uniformly paving the turning chips 3 processed in the step 2) in a cavity of a cylindrical outer die 1 with the inner diameter of 240 mm;
4) placing a cylindrical pressure head 2 matched with the cylindrical outer mold 1 above the turning scraps 3;
5) the cylindrical pressure head 2 is connected with a hydraulic press, the hydraulic press is started to drive the cylindrical pressure head 2 to extrude the turning scraps to prepare a scrap round cake 4 with the thickness of 50mm and the diameter of 240mm, and the scrap round cake is taken out, packaged and stored for later use;
6) placing the prepared chip material round cake 4 on a sizing block 5, then placing a steel die 6 on the sizing block 5, so that the chip material round cake 4 is positioned at the center of an inner cavity of the steel die 6, the chip material round cake 4 is concentric with the inner cavity of the steel die 6, and a 13mm gap space is formed between the circumference of the chip material round cake 4 and the corresponding cavity wall of the steel die;
7) adopting an induction smelting furnace to smelt GH4169 alloy, and pouring the alloy liquid 7 into the inner cavity of the steel die 6 after the alloy liquid reaches the pouring condition;
8) and after the alloy liquid 7 is cooled and formed, removing the sizing block 5 for recycling, and obtaining the GH4169 high-temperature alloy cast ingot.
In practical production application, chip material cakes with different thicknesses are selected according to different high-temperature alloys, the chip material cakes with the thinner thickness are selected when the melting point is lower, and the chip material cakes with the larger thickness are selected when the melting point is higher. In addition, the thickness of the scrap cake can be continuously adjusted according to the actual casting result, and the sizing block is optimally not adhered to the obtained high-temperature alloy cast ingot.
Claims (7)
1. A method for preventing a base from being melted and adhered during high-temperature alloy casting is characterized by comprising the following steps:
1) selecting scraps with the same components as the high-temperature alloy to be poured, and compacting to prepare a scrap cake with the thickness of 30-50mm and the cross section shape matched with that of the inner cavity of the mold, wherein the scrap number with the length of more than or equal to 80mm accounts for not less than 60% of the total number of the scraps;
2) placing the scraps cake prepared in the step 1) in the center of an inner cavity of a mold and on a base, wherein a clearance space of 8-13mm is formed between the periphery of the scraps cake and the corresponding cavity wall of the mold;
3) and after the high-temperature alloy to be cast is smelted as alloy liquid and reaches the casting condition, pouring the alloy liquid into an inner cavity of a mold, surrounding a scrap material cake with the alloy liquid, carrying out heat absorption melting on the scrap material cake and mixing the scrap material cake with the alloy liquid, and taking off a base after the alloy liquid is subjected to heat release cooling forming to obtain the high-temperature alloy ingot.
2. The method for preventing the melting adhesion of the base during the pouring of the high-temperature alloy according to claim 1, wherein the scraps in the step 1) are subjected to cleaning, oil removal and drying treatment and then are compacted to form a scrap cake.
3. The method for preventing the melting adhesion of the base during the pouring of the high-temperature alloy according to claim 1, wherein the chips obtained in the step 1) are turning chips, and the turning chips are compacted into round cakes or square cakes with the thickness of 30-50 mm.
4. The method for preventing the fusion and adhesion of the base during the pouring of the high-temperature alloy as claimed in claim 1, wherein the compaction in the step 1) is carried out by extrusion forming through a cake making device.
5. A method of preventing molten adhesion to a base during casting of a superalloy as in claim 4, wherein the briquetting apparatus comprises a cylindrical outer die and a cylindrical ram connected to the press and clearance fitted in a cavity of the cylindrical outer die.
6. The method for preventing the melting adhesion of the base during the pouring of the high-temperature alloy according to claim 5, wherein the scraps selected in the step 1) are uniformly laid in the cavity of the cylindrical outer die, and the cylindrical press head is driven by a press machine to compact the scraps to form a scrap cake.
7. The method for preventing the melting adhesion of the base during the pouring of the high-temperature alloy as claimed in claim 5, wherein the press machine is a hydraulic press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711252059.XA CN108188361B (en) | 2017-12-01 | 2017-12-01 | Method for preventing base from being fused and adhered during high-temperature alloy pouring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711252059.XA CN108188361B (en) | 2017-12-01 | 2017-12-01 | Method for preventing base from being fused and adhered during high-temperature alloy pouring |
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| CN108188361A CN108188361A (en) | 2018-06-22 |
| CN108188361B true CN108188361B (en) | 2020-05-01 |
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| US1923000A (en) * | 1930-12-23 | 1933-08-15 | Ass Elect Ind | Production of metal castings |
| US2453643A (en) * | 1945-11-07 | 1948-11-09 | William E Schmertz | Metal teeming |
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| Publication number | Publication date |
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| CN108188361A (en) | 2018-06-22 |
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